#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include <uv.h>

uv_loop_t* loop;
uv_async_t async;

double percentage;

void fake_download(uv_work_t* req) {
  int size = *((int*)req->data);
  int downloaded = 0;
  while (downloaded < size) {
    percentage = downloaded * 100.0 / size;
    async.data = (void*)&percentage;
    uv_async_send(&async);

    sleep(1);
    downloaded += (200 + random()) % 1000; // can only download max 1000bytes/sec,
                                           // but at least a 200;
  }
}

void after(uv_work_t* req, int status) {
  (void)req;
  (void)status;
  fprintf(stderr, "Download complete\n");
  uv_close((uv_handle_t*)&async, NULL);
}

void print_progress(uv_async_t* handle) {
  double percentage = *((double*)handle->data);
  fprintf(stderr, "Downloaded %.2f%%\n", percentage);
}

int main() {
  loop = uv_default_loop();

  uv_work_t req;
  int size = 10240;
  req.data = (void*)&size;

  uv_async_init(loop, &async, print_progress);
  uv_queue_work(loop, &req, fake_download, after);

  return uv_run(loop, UV_RUN_DEFAULT);
}
